Heating boiler with vertical undulating flue



March 31, I953 B. w. MANDELBURG HEATING BOILER WITH VERTICAL UNDULATING FLUE Filed April 15, 1950 3 Sheets-Sheet l INVENTOR. EA/ 0167 w MANDELBURG March 31, 1953 B. w. MANDELBURG 3,

HEATING BOILER WITH VERTICAL UNDULATING FLUE Filed April 15, 1950 s Sheets-Sheet 2 1 2 F? l 'l I W 44 1/ :21- f a INVENTOR. EE/VED/CT m" MANDELBURG ifj/W QTTORIVEY March 31, 1953 B. w. MANDELBURG 2,633,107

HEATING BOILER WITH VERTICAL UNDULATING FLUE Filed April 15, 1950 3 Sheets-Sheet 3 I ll I "0 /03 I06 w I06 I 6 104 I02 IN VEN TQR.

BENEfl/CT (ll/VA/VPELBUR'G nrrak NEY- Patented Mar. 31, 1953 HEATING BOILER WITH VERTICAL UNDULATING FLUE Benedict W. Mandelburg, Scarsdale, N. Y.

Application April 15, 1950, Serial No. 156,116

8 Claims. 1

This invention relates to heating boilers and more particularly to expansion relief doors therefor.

It is an object of the present invention to provide in a heating boiler an internal automatic damper adjacent the stack outlet whereby to relieve the boiler of internal pressure resulting from the heat expanded gases and to prevent rumbling and pulsations which often occur in such boilers. It is another object of the present invention to provide an automatic control valve which can be set into the boiler through the stack outlet or built into the boiler during its construction and wherein there is means extending from below the stack outlet to adjust the valve element to give it a definite and variable open position to relieve by degrees such excess or back pressure as may develop during the process of combustion.

It is still a further object of the present invention to provide an integral round stack outlet for boilers which has a distinct advantage during construction and when the boiler is installed by saving the making of an extra part to be attached in the manufacture, and in installing it, it saves time over that which is required for the oblong, obrotund or obround type of smoke outlet and the need of making an adapter to fit on the boiler with one end being oblong, obrotund or obround and the other end round.

It is still a further'object of the invention to' provide an adjustable relief valve or damper within the heating boiler adjacentto the flue outlet cf theboiler whereby to manually control the passage of the flue gases to the outlet to shorten the travel of the gases through the boiler and reduce the internal resistance of the boiler and to adapt the boiler to variations in combustion and draft that is inherent to a particular installation and varying atmospheric conditions.

Other objects of the present invention are to provide an internal damper valve for' boilers to automatically relieve the same of excess pressure of the heating gases, which is of simple construction, easy to install in the boiler, inexpensive to manufacture, automatic in operation, can be adjusted manually either internally or at an external point, has a minimum number of parts, adjustable to different size openings, adapted to be installed through the stack outlet opening or built within the boiler as an integral part, and efficient in operation. I

For otherobjects and for a better understanding of the invention, reference may be had to the following detailed description :taken in connection with the acc mp ny g d awing, in which provided water bafiies l8.-

Fig. 1 is a perspective view of a complete boiler with portions broken away to show the fire box and the passages of Water and heating gases through the boiler and wherein there is installed according to one form of the invention, a flapper or swinging valve to automatically bypass flue gases when an abnormal expansion of such gases occurs.

Fig. 2 is an enlarged fragmentary and perspective view of a boiler and of a damper valve assembly constructed according to another form of the invention and illustrating the manner in which the assembly is fitted into the boiler through the stack outlet. p v

Fig. 3 is a vertical sectional view takenthrough the boiler and through the valve assembly of the form of the invention shown in Fig. 2.

Fig. 4 is an elevational view looking into the end of the stack outlet of the boiler and upon the valve assembly.

Fig. 5 is a perspective view of a further form of a valve assembly.

Fig. 6 is a perspective view of a still further form of valve assembly. 7

Fig. 7 is a vertical and perspective'sectional view of a tubular boiler employing the valve arrangement which includes a second damper valve connected with the valve assembly to be operated therewith and stationed at a location below the main valve.

Fig. 8 is an enlarged fragmentary and sectional view of the valve arrangement shown in Fig. 7 with both of the valve elements elevated to open positions.

Fig. 9 is a fragmentary view of a modified form of the invention. H

Referring now particularly to Fig. 1, l2 represents a fire box into which extends a gun type oil burner l3. Flames, which are extended into the fire box and against firewall surfaces l4 thereof, are elevated into a tubeless' plate steel boiler assembly,' indicated at I5. The boiler assembly is provided with an internal shell l6 and an external shell I! between which is water space for the flow of water. To control the flow of water through the vertical water space, there are The gases flow upwardly and back and forth in the boiler assembly. A round stack outlet [9 extends from the inner shell I6 and is integral therewith. This round stack outlet gives less restriction for the outlet passage of the flue gases than with prior'types of boiler constructions and eliminates the necessity for an external stack box coming from an oblong, obrotund or obround outlet of the usual boiler.

According to the invention, the flue fi-a'ses follow the path generally indicated by the arrows 20, 20a, 20b, 26c and 26d. The flue gases are constrained to the lower path 26a by a lip 2|a along the side wall section Ia, and engaging the surface of the inner shell l6. After following the path indicated by arrow 201), the gases are then constrained to the upper path .260 by an integral baflle wall 2| that lies across the boiler assembly to normally divert the rising heating gases laterally over an upper heating section of the boiler assembly. In order to relieve the boiler of an excess pressure of these heating gases and to bypass a portion of such gases to the stack outlet IS, an expansion relief or flapper valve 22 is hinged to the inner shell at 23 and extends over the inclined baffle 2|. The baflie 2| has an opening therein through which the gases can be projected upon the same lifting the flapper valve 22 for communication Withthe stack outlet thereby to shorten temporarily the travel of part or all of the flue gases.

Surrounding the outer shell I1 is insulation 24 and a casing or jacket 25 forming the exterior of the combined boiler and burner. In one end of the boiler is a return opening 26 for the water and drain or outlet openings 21 and '28. A cover 29 is adapted to fit 'over the top of the casing 25 and facing upwardly through the jacket is a radiator supply connection opening 31 through which the steam or water passes from the boiler. In this cover 29 are ventilating openings 32 lying above space 33 in front of the boiler and burner assembly.

Lying in the upper section of the boiler and surrounded by the water and steam being developed by the boiler are a set of domestic hot water coils 34 that extend through the end of the casing to provide outlet and inlet connections 36 and 31. The bafile plate 2|, according to this form of the invention, can be built in at the time the boiler is fabricated from the various sheet steel shapes or parts. The flap valve 22 can be installed later by insertion through the stack outlet by the mere connecting together of the hinge parts of the inner shell and the plate 22.

Referring now particularly to Figs. 2, 3 and 4, there is shown a modified form of construction wherein the bafile plate assembly is inserted in its entirety through the stack outlet for its assembly upon the inner shell of the boiler. The inner shell heating sections of the boiler are indicated at 42, 43 and 44 of Fig. 2 and they are spaced apart from one another to permit the normal flow of the heating or flue gases thereover in the usual serpentine fashion. The heating gases finally leave the boiler from over the inner shell heating section 44 and through stack outlet 45 which is round and integrally connected to a wall portion 45' of the inner shell. The outer shell is indicated at 46 and between the shells is water space 41. Insulation 48 lies externally of the outer shell 46 and about this is a sheet metal casing 49.

On the upper inner shell heating section 44 is.

a depending ledge or lip 5| (Figs. 2 and 3) on which a removable baiile plate 52 can be rested when inserted into the boiler through the stack outlet 45. The lower edge of the baffle plate 52 can be rested on a transversely extending shoulder 53 and upon the bottom of the inside surface of the stack outlet pipe 45.

Assembled upon the baffle plate 52 is a hinged valve plate 54 which extends over an opening 55 in the plate 52 and is hinged to the bafile plate,

as indicated at 56. In order to fix the bafile plate 52 within the boiler against displacement and to keep it from lifting, there is a forwardly extending tongue 51 that can be bent to the proper angle and secured by a screw or bolt 53 (Fig. 3) to the bottom of the stack outlet 45. This tongue and the stack outlet is suificiently thick to receive screw threads.

The hinged valve plate 54 has a bent strap piece 59 that extends forwardly from the same and will rest upon an adjusting screw 6|. If it is desired to keep the valve plate 54 open a slight amount, the screw 6| is raised sufliciently t lift the plate 54 to allow for leakage of the flue gases through the opening 55. If additional opening space is necessary, the pressure of the gases will automatically lift the valve plate 54 to the required amount to relieve the internal pressure of the gases. As shown in Fig. 2, it will be seen that the baffle plate assembly can be inserted as a unit through the stack outlet into space between the sections 43 and 44 in order to effect the assembly of the baflie plate upon the depending ledge 5| andshoulder 53.

In Fig. 5, there is shown a modified form of the baffle plate assembly wherein the size of the opening in the baffle plate itself can be varied by a secondary name plate which is replaceable upon the main baflie plate. The main bafiie plate is indicated at 52' and is of the same shape as the plate 52 shown in Fig. 2 and has the same opening 55 therein. Above the opening 55 is a second removably connected plate 63. This second plate 63 is secured to the main plate 52' by fastening elements 64 and 65. This second plate 63' has openings 66 therein and hinged to it is a puff valve plate 61. This assembly of the plate 63 and the valve plate 61 can be removed and another assembly having difierent size openings 56 therein can be substituted therefor. The puii valve plate 61 may be removed from the plate 63 entire, if desired. The plate 63 which is used and the size of the openings will depend upon the characteristics of the boiler and draft conditions of the installation. In some installations, it may be desirable to have only small bypass outlet openings 66 and in other installations large-r outlet openings are preferred. The valve plate *6! is operated automatically and is without the strap bracket 59 of Fig. 2 for regulating its closed position.

In Fig. 6 there is shown a still further form of the invention wherein a large valve plate is used and the baflle plate itself has an extra large opening. The baffle plate is indicated at 52" and has the tongue 51. A; large elongated opening 68 is provided in the plate 52" and thereover lies a valve plate 69 which is hinged at H to the plate 52". This valve plate 69 will be-lifted automatically with the increase in pressure within the boiler to permit the flow of the flue gases through the stack without having to pass about the uppermost heating section 44. If desired, to definitely shorten the flue travel at times when the boiler is to be converted to the use of solid fuel which necessitates shorter flue travel, the plate 61 may be elevated to the full open position and rested against the section 44 to partially close the passage over the section 44 and to exhaust directly the gases from sections 42 and 43.

Referring now particularly to Figs. '7 and 8, there is shown the adaptation of the present automatic valve arrangement to a tubular boiler having tube sections H, 12, 13 and I4 spaced sections is in a serpentine manner.

from one another and about which is an inner shell providing the space through which the heating gases will flow. This shell 15 is jacketed by an outer shell 16 to provide a water space 11. The flow of the heating gases through the coil The lower section TI is blocked off at one side, as indicated at 18, and the gases flow upwardly over the other side of the section 11 and thereover. The section 12 is closed at the right side by an adjustable. bafile plate 19 which has its inner edge resting upon a ledge or shoulder 88 on the outer tube and 8801. on the inner shell of the boiler. The next section 13 is blocked off by a plate, as indicated at 8|, so that the gases may flow over the top of the section 13 after being forced to pass over the bottom of the coil section 13. Upon the gases passing between the coil sections 13 and 14, they will be elevated and pass: over a top plate 82 which has a depending ledge or shoulder 83 for supporting a baffle plate 84 having an opening 85 therein. The lower edge of the baflle plate 84 is supported on a shoulder 86 on the inner shell and the baffle plate 84 will thereby be retained in an inclined manner covering the space at the right of the tube section 14 which leads to integral stack outlet 81.

Hinged upon the bafiie plate 84 is a valve plate 88 having a bracket 89 which extends into the stack outlet 81. If it is desired to lift the plate 88, an adjusting screw 9|, which is threaded into the bottom of the stack outlet 81, can be turned to provide a stop against which the bracket 89 may abut to hold the valve plate 88 in an elevated position. The valve plate 88 is connected to the plate 84 by hinge means 92.

In order that a simultaneous adjustment can be effected with the plate 19 at the end of the section 12, a link 93 ispivotally connected by its ends, as indicated respectively at 94 and 95, to the respective plates 19 and 88.

It will be seen that if pressure is suddenly increased within the heating space that the gases can be bypassed to the stack outlet 81 from under the section 12 by lifting the valve plates 19 and 88. The tube sections 12, 13 and 14 can thereby be bypassed and a quick release or relief of the gases is effected through the stack outlet 81 and the flue travel is substantially shortened. The domestic hot water coil is completely within the upper space of the boiler as indicated at 91 and has connections 98 which extend through the outer shell 16.

It will be seen that where it is desired to convert a boiler from an oil burning type to a solid fuel type, the path of the heating gases must not be so long and this conversion to a short travel of the gases can be effected quickly through the adjustable valve plate assemblies which have been provided by this invention. The adjusting screw can be elevated to leave the openings in the bafile plate free to pass the flue gases at alltimes or, if desired, the baffle plate itself can be readily removed through the stack outlet.

It will be apparent also that there has been provided a boiler having a round integral stack outlet. The outlet is integral with the inner shell and through to the outer shell for connection with a chimney to exhaust the flue gases from the boiler.

In Fig. 9, there is shown a form of the invention having an inner shell I8I which is folded at different elevations to provide the vertically spaced water carrying sections I 82 extending respectively and alternately from the opposite sides solid fuels.

of the boiler to provide a serpentine passage I83 through which the flue gases pass. About the inner shall is an outer shell I 84 that is spaced from the inner shell to provide a water space I85 with which the water carrying sections I83 communicate. Penetrating the outer shell and integrally connected with the inner shell is a stack outlet structure I86 that communicates with the upper end of the serpentine passage to pass the flue gases to the chimney. At times when it is desired to convert the boiler from one burning oil to a boiler burning solid fuels, it is necessary that the flue passage be shortened. Accordingly, there is associated with the water carrying section I83 bypass means indicated generally at I81 and including a pipe I88 and a valve plate I89 hinged at H8 to the top of the water carrying section and adapted to be elevated to permit the bypass of the gases directly to the stack outlet structure from beneath the water carrying section I83. An adjust-able screw H I can retain the valve plate I89 in an elevated position. If desired, the adjusting screw II I can be retracted to a point to permit the valve plate I89 to rest flush over the upper end of the pipe I 88 so that the bypass means provides an expansion relief valve for the boiler. The plate I89 is left in an elevated position at times when the boiler is being heated by The bypass pipe I88 interconnects portions of the heating gas passage at different points therealong and at different elevations. Accordingly, the heating gas passage has been shortened when the valve plate I89 is elevated.

Accordingly, there has been provided a stack outlet which is shaped to take the full flow of gases leaving the space within the boiler. This stack outlet is welded to the inner and outer shells and becomes an integral part of the boiler. The stack outlet opening bridges the flue travel spaces above and below the top heating section and by placing a baffle between the lower part of stack outlet and the edge of the top heating section, as, for example, of the heating section 44, the flue gases take the full travel through the boiler, circulate around the section 44 and over the top thereof, downwardly into the stack outlet 85 and outwardly thereof to the chimney. This is accomplished without restriction of the gases at any point during their travel.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

I claim:

1. A boiler construction comprising inner and outer shells spaced apart to provide a water space therebetween, said inner shell having substantially horizontally-extending, water-carrying heating sections vertically spaced from one another and interconnected through said water space, said heating sections being arranged to provide for the normal serpentine flow of heating gases around and between the heating sections, a cylindrical integral stack outlet structure extending between the inner and outer shells and lying in an elevated location adjacent the uppermost heating section and bridging spaces lying above and below the uppermost heating section, and transversely-extending, downwardly and rearwardly inclined baflle means in the interior of the boiler extending from the uppermost heating section to the wall of the inner shell adja- 7 cent. to and below ;thelower part of the. stack outlet structure. I

.2. A boiler construction as defined in claim 1 and said bafiie means having a pressure-relief opening and a pressure-relief valve hinged over said relief opening.

3. A boiler construction as defined in claim 1 and said baiile means having a pressure-relief opening and a pressure relief valve hinged over the opening, and control means mounted on the stack outlet and available for adjustment externally of the boiler, said control means being con nected to the relief valve to adjust the normal position of said relief valve.

4. A boiler construction as defined in claim 1 and said bafile means comprising a main baffle plate having an opening therein, a relief valve hingedly connected to the main plate and disposed normally to cover the opening, a bracket fixed to the relief valve and extending into the stack outlet and a manually adjustable screw extending through the bottom of the stack outlet .and available from outside the stack outlet, the inner end of the screw being engageable with the bracket to provide an adjustable stop to retain the relief valve in different open positions. 5. A boiler construction as defined in claim 1 and said baflle means having a main bafiie plate with an opening therein, a secondary bafile assembly releasably secured to the main bafile plate and disposed to be positioned over the opening thereof, said secondary baifie assembly including a control plate having an opening therein smaller than the opening of the main bailie plate and a relief valve plate hinged to the control plate to cover the opening in said control plate, said secondary bafile assembl being replaceable by another assembly having a control plate with a different size opening.

6. A boiler construction as defined in claim 1, and said bafile means comprising a main bafile plate having an overall width less than the diameter of the outlet structure whereby to permit the insertion through the outlet structure into the boiler of the main baffle plate, the space below the-uppermost heating section-being adapt- .ed to receive the main baffle plate while being .other heating section and the inner shell and interconnecting means extending between the relief valves and through the pressure relief opening whereby to efiect simultaneous operation and adjustment of said relief valves.

8. A boiler construction as defined in claim 6 and said main baflle plate having a tongue adapted to extend into the stack outlet when the main btflle plate is in place, fastening means accessible from the exterior of the outlet structure to fix the tongue to the outlet structure, a bracket extending from the relief valve into the outlet structure and an adjusting screw in the outlet structure and engageable with the bracket on the pressure relief valve to adjust the normal position of said valve.

BENEDICT W MANDELBURG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 462,683 Blackmore et al. Nov. 10, 1891 52%,2 18 Harkins Aug. 7, 1894 541,737 Gait June 25, 1895 1,837,435 Rember Dec. 22, 1931 1,837,534 Conklin Dec. 22, 1931 1,981,895 Banta Nov. 2'7, 1934 2,037,665 OHara Apr. 14, 1936 2,119,606 Staufi'er June 7, 1938 FOREIGN PATENTS Number Country Date 52,864 Australia, Oct. 1, 1911 

